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What really happens during red light therapy? The scientific truth.

Marketing Clearlight - 10 November 2025 - 1 min

Key takeaways

Photobiomodulation describes how light of specific wavelengths interacts with cells.
What matters is visible red light (600–660 nm) and near-infrared (800–850 nm).
Studies investigate how mitochondria absorb this light and whether that affects ATP production; they did not use Helsi™ devices.
Helsi™ red light panels work in exactly these ranges, peaking at 660 and 850 nm.

To understand the health effects of red light therapy, one must understand photobiomodulation.

In this video, Johannes, founder of Helsi™, explains simply and understandably what photobiomodulation is and why it forms the basis of modern red light therapy.

What photobiomodulation means
Which wavelengths are crucial (red & near-infrared)
How light activates mitochondria and produces energy
Why over 7,000 studies prove its effectiveness

Light	Range	Helsi™ peak	Visibility
Red light	600–660 nm	660 nm	visible
Near-infrared	800–850 nm	850 nm	invisible

Photobiomodulation wavelength ranges

Keep reading

Light Therapy & Red Light Therapy: Benefits for Cellular Health & Well-being

Patric Heizmann in conversation about infrared light: "No miracle cure – but a valuable tool when used correctly"

How to use red light therapy

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